teacher wrote:From the first equation :
[tex]a_1 = \frac{(28-11d)}{2}[/tex]
[tex]a_1 = 14-5.5d[/tex]
then solve the quadratic equation and find d
charlie_eppes wrote:teacher wrote:From the first equation :
[tex]a_1 = \frac{(28-11d)}{2}[/tex]
[tex]a_1 = 14-5.5d[/tex]
then solve the quadratic equation and find d
charlie_eppes wrote:Find [tex]a_{1}[/tex] and "d" in this arithmetic progression.
[tex]|a_{5}:a_{3}=4[/tex]
[tex]|a_{2}.a_{6}=-11[/tex]
What about this?
charlie_eppes wrote:[tex]|{a_{5}}^{2}-{a_{3}}^{2}=72[/tex]
[tex]|a_{5}+a_{8}=28[/tex]
Something is wrong in my answers. I can't define it.
And this
[tex]|5a_{1}+10a_{5}=0[/tex]
[tex]|S_{4}=14[/tex]
Find the sum of the numbers
1 + 2 + 3 + ... + 100 = ?
Return to Progressions, Series
Users browsing this forum: No registered users and 2 guests